A term meaning a lesbian who now partakes in heterosexual activities.
However, it does not mean that a woman has CHANGED her sexual orientation, that is something which does not change. She may however have changed her sexual behavior or identity.

The woman may truly be straight and have previously been questioning, or the woman may have been a lesbian who has retreated into the closet, or the woman may be bisexual, omnisexual or something else of that nature but by no means can a person change their orientation.